<template>
    <div class="upload-container">
        <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click="dialogVisible=true">
            上传图片
        </el-button>
        <el-dialog class="el-editor-upload" title="图片上传" :visible.sync="dialogVisible" append-to-body>
            <el-upload 
                :multiple="true"
                :file-list="fileList"
                :show-file-list="true"
                :on-remove="handleRemove"
                :on-success="handleSuccess"
                :before-upload="beforeUpload"
                class="editor-slide-upload"
                :action="baseURL + '/public/api/file/upload'"
                :headers="headers"
                list-type="picture-card"
            >
                <el-button size="small" type="primary">
                    点击上传图片
                </el-button>
            </el-upload>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="handleSubmit">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
import { baseURL } from '@/utils/urls'
export default {
    name: 'EditorSlideUpload',
    props: {
        color: {
            type: String,
            default: '#1890ff'
        }
    },
    data() {
        return {
            dialogVisible: false,
            listObj: {},
            fileList: [],
            baseURL: baseURL,
            ossURL: this.$store.getters.oss_url + '/',
            headers: {
                Authorization: 'Bearer ' + this.$store.getters.access_token
            }
        }
    },
    methods: {
        checkAllSuccess() {
            console.log(Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess))
            return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
        },
        handleSubmit() {
            const arr = Object.keys(this.listObj).map(v => this.listObj[v])
            if (!this.checkAllSuccess()) {
                this.$message('请等待所有图片成功上传。如果存在网络问题，请刷新页面并重新上传！')
                return
            }
            this.$emit('successCBK', arr)
            this.listObj = {}
            this.fileList = []
            this.dialogVisible = false
        },
        handleSuccess(response, file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    this.listObj[objKeyArr[i]].url = this.ossURL + response.data[0]
                    this.listObj[objKeyArr[i]].hasSuccess = true
                    return
                }
            }
        },
        handleRemove(file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    delete this.listObj[objKeyArr[i]]
                    return
                }
            }
        },
        beforeUpload(file) {
            const _self = this
            const _URL = window.URL || window.webkitURL
            const fileName = file.uid
            this.listObj[fileName] = {}
            return new Promise((resolve, reject) => {
                const img = new Image()
                img.src = _URL.createObjectURL(file)
                img.onload = function() {
                    _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }
                }
                resolve(true)
            })
        }
    }
}
</script>

<style lang="scss">
.el-editor-upload {
    .el-dialog {
        width: 600px;
        .editor-slide-upload {
            margin-bottom: 20px;
            /deep/ .el-upload--picture-card {
                width: 100%;
            }
        }
    }
}

</style>
